Background
On September 20th, 2007, President Bush signed into law H.R. 2358 "Native American $1 Coin Act" which approves a new change to the dollar coin program of the United States. 

On the heels of the launch of the new Presidential $1 Dollar Coin Program in 2007, the US Mint will actually launch another, parallel program beginning in 2009.

Details
The new Native American dollar coins will be a modification of the existing Sacagawea dollar coins, and will feature the following:

• Edge-incused text.  Like the Presidential dollar coins, these new dollar coins will feature the year, mint-mark, and "E Pluribus Unum" inscribed on the edge.  This will allow the face of the coin to feature larger designs.
  
  
• Coin obverse.  One side of the coin will continue to feature Sacajawea, similar to the existing Sacajawea dollar coins in production since 2000.
  
  
• Coin reverse.  The reverse of the coin will feature one of several approved designs celebrating important figures and events from Native American history.
  
  
• In God We Trust.  As per the H.R. 2764 bill passed on December 27, 2007, the phrase "In God We Trust" will be kept on the face of the coin, and not be placed on the edge.  As of 2009, this change will also be in effect for the Presidential $1 Dollar coins.
  

New Designs
While the designs for the new coins have not been released, the law does specify the different reverse designs that may be examples of the final selections:

• The creation of Cherokee written language
• The Iroquois Confederacy
• Wampanoag Chief Massasoit
• The `Pueblo Revolt'
• Olympian Jim Thorpe
• Ely S. Parker, a general on the staff of General Ulysses S. Grant and later head of the Bureau of Indian Affairs
• Code talkers who served the United States Armed Forces during World War I and World War II

Interestingly, the law specifies that the reverse designs cannot feature a person so large as to make the coin look like a "double-faced" coin.  It also specifies that the Sacajawea coins must remain 20% of the total dollar coins minted, which is a lower percentage than the original Presidential dollar coin program.

Updates
These new dollar coins will begin issue in 2009, at a rate of 1-per-year, to replace the current existing Sacajawea coins.  When the US Mint releases updates on design images and exact configurations for circulated and collector editions, I will update this guide.

If you found this guide helpful, please vote "yes" below.  The more votes this guide gets, the easier it will be for other collectors to find it.